We use cookies to track usage and preferences. See Cookie Policy
Pocketmags Digital Magazines
Pocketmags Digital Magazines

DIVER TESTS - Ratio iDive Easy dive computer

DIVER TESTS - Ratio iDive Easy dive computer

Posted Monday, March 21, 2016   |   8303 views   |   Sport   |   Comments (0) NIGEL WADE tests a new dive-computer with everything but bells and whistles

WHAT DO WE EXPECT FROM A DIVE COMPUTER? I know what I want, and that’s a tool to let me know what my current depth is, how deep I’ve been, how long I’ve been down and, most importantly, how long I can stay under water without any deco penalties. 
Every modern dive computer does exactly that, but some models offer more, much more. The iDive Easy computer from Italian designer Ratio is being distributed in the UK by Liquid Sports and has more functions than I could wag a stick at, as I found out during a dive trip to the island of Mauritius. 

The Hardware
The iDive Easy is a wristwatch-style instrument with a 47mm-diameter x 16mm deep polished 316L stainless-steel case and a scratch-resistant sapphire crystal glass face. This solid case gives the computer a depth-rating of 220m. 
The 40mm-diameter 80 x 80-pixel matrix LCD backlit display has oversized graphics. Menus and functions are accessed via three of four spring-loaded buttons at the 2, 4, and 8 o’clock positions, while the button at 10 o’clock activates the backlight. 
A single long-life USB rechargeable battery similar to those used in smartphones and tablets powers the iDive range. Charging is done via a USB interface cable with gold-plated terminals that bayonet into the iDive’s connection terminal. 
The computer has an automatic sleep mode. The display is switched off if the iDive is still for five minutes, which allows for claimed battery burntimes of up to 25 hours in Dive mode, two months in Watch mode and up to six months in Total Sleep mode. As soon as the sensor detects movement, the display is switched on. 
The strap is a heavy-duty silicon buckled version supplied with a separate extension for use over bulky exposure suits. The iDive Easy is available in eight colour schemes, and a Sea Jewel version with Swarovski crystals set around the periphery of the face is also available. 
A dedicated nitrox analyser can be added for the entire range of Ratio multi-gas computers. This simply connects via the bayonet charging port and automatically calibrates and validates its oxygen sensor. You’ll have to manually set the analysed mix into the computer, however, as current Health & Safety rules don’t allow this to be done automatically.

The Algorithm
The Easy model is a two-mix air/nitrox computer employing a real-time Buhlmann ZHL-16B algorithm to calculate tissue-saturation status and accurately and safely formulate repetitive dive-profiles. Safety-stop depths can be user-set, as can the choice of deep stops in a customisable menu system. 
Modes & Functions
The iDive Easy has Air, Nitrox, Freedive, Gauge, Planning and Logbook modes, standard fare on nearly every available timepiece-style dive-computer, as are Watch and Chronometer modes. However, this dive instrument offers a further array of functions, which include a 3D self-compensating compass, an altimeter with automatic compensation for altitude diving, a thermometer and a barometric pressure gauge. 
Again, these functions aren’t unique in the dive-computer world but the iDive range goes beyond that and includes a current moon phase mode in which full, new, waxing and waning phases of the moon can be predicted. 
Then there’s a pitch & roll function indicated on both a vertical and horizontal axis and, for the diver who has everything, a magnetometer to help out if you’re looking for something big and made of iron. 
For the fitness enthusiasts among us there’s also a pedometer to record steps, mileage and burned calories during those early-morning jogging sessions.

In Use
I dived with this instrument on an intensive seven-day itinerary and, as is usual practice with computer tests, I also took my own tried and trusted model to add a safety net should things not go according to plan. 
After taking time to digest the downloaded PDF instruction manual (as best I could) and a simple, short charging process using my iPhone wall-charger, I delved into the menus to set personal parameters such as safety-stop depths, alarms and gradient factors. 
I then set the contrast and brightness of the backlight and set it to stay on for its maximum duration of 30 seconds, in the knowledge that the battery could be recharged after each day’s diving. 
The menus were accessed with single pushes of three buttons. They’re stiff and left me with sore fingers, but have the advantage of being almost impossible to activate accidentally. 
Donning the computer for the first dive, I noticed that the strap was shorter than other models I’ve used, which meant that without the extension strap I had to roll up my wetsuit sleeve and attach the computer around my bare wrist. 
My wrists (unlike my belly) are skinny, so this was a surprise, and something chunkier divers might need to take into account. 
Under water, the display was easy to read. The crisp LCD matrix had great contrast (especially when backlit) and is set out in such a way as to make assimilating the information shown 
very easy. 
The important stuff such as present depth and no-deco limits are displayed using big and bold fonts with the maximum depth, oxygen percentage or ambient temperature in smaller fonts. Safety-stop information when displayed was counted down in minutes and was instantly recognisable. 
I tried a variety of the functions including the compass. Its display was a delight to use, showing the direction not only as large N, S, E and W letters but also in degrees. 
I also used the moon-phase utility, a “nice to have” function for calculating the likelihood of clownfish and other marine species having recently laid eggs during a full moon.
I also used the pitch & roll feature to assess my orientation under water accurately (something I’m sure disciplined GUE technical divers would find useful). 
Unfortunately nitrox isn’t readily available in Mauritius, so I couldn’t check out the gas modes or use the dedicated Ratio O2 analyser.
This little wristwatch-sized dive computer did exactly what I expected it to do, in a no-fuss, logical manner.  The standard functions can be found on virtually all of the dozens of dive instruments on the market. 
In my mind it’s the rechargeable battery that makes the Ratio iDive stand out from the crowd. This was apparent as my own model gave me the dreaded “Low Battery” warning a few dives into this trip, meaning that I would have to go through the inconvenience of packing it up, queuing at the Post Office and spending some money to put it right.
I did find some of the unique extras on the iDive Easy useful. No, as expected, I didn’t use the pedometer, but I did use the moon phase and pitch & roll functions along with the compass. 
Although I didn’t get to use it, I think the addition of the dedicated O2 analyser is genius. No longer would I have to queue to use the dive centre’s well-used analyser to verify my gas mix and, unless anyone else had a Ratio, I wouldn’t have to share mine either. 
I don’t think I’ll ever need a magnetometer. Big iron-hulled wrecks are normally easy to find – but it would give me the bragging rights down the boozer.

PRICE - (as at 21 Janaury 2016) ?375. O2 analyser ?200 
TYPE - Wristwatch, air and nitrox options 
SIZE - 47mm dia x 16mm
WEIGHT - 140g 
ALGORITHM - Buhlmann ZHL-16B
DIVE MODES - Air, Nitrox, Freedive, Gauge
FUNCTIONS - Watch, chronometer, compass, barometer, altimeter, pitch & roll, moon phase, magnetometer, pedometer
COLOUR OPTIONS - Black, white, yellow, blue, red, turquoise, purple, orange
DIVER GUIDE - 9 out of 10

For more great articles like this get the MARCH 2016 issue of DIVER below or subscribe and save.

Single Issue - APRIL 2018 Replica Edition included
Or 299 points
Annual Digital Subscription
Only $ 1.67 per issue
Or 1999 points
6 Month Digital Subscription
Only $ 2.00 per issue
Or 1199 points
Monthly Digital Subscription
Only $ 1.99 per issue
Or 199 points

View Issues


DIVER is Britain's best-selling scuba diving magazine – regularly out-performing all its competitors combined on the open market.

More great content like this...

For more great articles like this subscribe to DIVER today.

Most read articles this month

Failsafe  fingering

Failsafe fingering

In answer to a reader’s question, Graham Fitch addresses the complex subject of how to find fingering that works for you More...
Christmas Gifts for Her

Christmas Gifts for Her

Stuck for gift ideas for the lovely lady in your life? The Pocketmags team have pooled all their best ideas for gifts for her this Christmas. Get ready to earn some serious brownie points! More...
Christmas Gifts for Him

Christmas Gifts for Him

Why are men so hard to buy for?! If you're looking for gift ideas for the deserving gent in your life, look no further; the Pocketmags team have found some amazing gifts for him this Christmas. Boring socks begone! More...
Lift your  chances

Lift your chances

Be ready for your sixty-second chance to shine with Adrian Magson’s pitch correction More...


Nashville songwriter Mark Cawley shares some tactics for reviving those elusive creative juices when you’ve lost the flow More...
Baking Heaven's Banoffee Loaf

Baking Heaven's Banoffee Loaf

Brought to you by Baking Heaven, this Banoffee Loaf is just the sweet treat you're looking for. It's sure-fire family hit, here’s how to make the most of this delicious Banoffee Loaf... More...
3 Free Reads for the New Year

3 Free Reads for the New Year

Spend all your money in December? Us too. We’ve pulled together our 3 favourite free reads available for you on Pocketmags. Everyone loves a free read! More...
Great British Food's Pomegranate & Chocolate Cake

Great British Food's Pomegranate & Chocolate Cake

If you visit Morocco in autumn you will notice fresh pomegranates wherever you go. The beautiful seeds are eaten after a meal, squeezed for a refreshing drink, or scattered, jewel like, over sweet and savoury dishes. This fantastic cake uses tangy pomegranate molasses in the base and the vibrant ruby red seeds are scattered over the top to add a pop of colour and refreshing bite. More...
Did your ancestor leave a will?

Did your ancestor leave a will?

For non-family historians, the appeal of a long-lost relative’s will is that they might find themselves a beneficiary. But for us, wills can provide an invaluable collection of names, relationships and clues to family members from times gone by. June Terrington examines this rich collection of records More...
Glasgow Museums’ collection  of Anchor Line posters

Glasgow Museums’ collection of Anchor Line posters

Emily Malcolm, Curator of Transport & Technology, explores a colourful collection of historic travel posters, which convey the excitement of world travel in years gone by More...
Vouchers Gift Cards A magazine subscription is the perfect gift but you'll need something to show on the big day. View All
Ways to Pay Pocketmags Payment Types
At Pocketmags you get Secure Billing Great Offers HTML Reader Gifting options Loyalty Points